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Marathon Calendar Ontario 2026-2027

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Monthly updates for Ontario

Get new running races (and updates) in your inbox every month.

Explore the best marathons in Ontario for 2026-2027! Our updated list features 20 exciting races across the region. Find your next race in Ontario below and join the running community at these great events!

April 2026
Apr
25
Sa

St Lawrence Marathon

5 km 10 km Half Marathon Marathon
Apr
26
Su

Beneva Mississauga Marathon

5 km 10 km Half Marathon Marathon
May 2026
May
3
Su

Spring Fling Marathon

5 km 10 km Half Marathon Marathon
May
3
Su

Toronto Marathon

5 km 10 km Half Marathon Marathon
May
23-24
Sa - Su

Tamarack Ottawa Race Weekend

5 km 10 km Half Marathon Marathon
June 2026
Jun
20
Sa

Community Strong Race

5 km 10 km ... Marathon 61 km
Jun
20
Sa

Niagara Ultra

10 km Half Marathon ... 50 km 80 km
July 2026
Jul
4
Sa

The Limberlost Challenge

Trail Run 7 km 14 km ... Marathon 56 km
Jul
18-19
Sa - Su

Xterra Conquer the Crater

Trail Run 5 km 10 km Half Marathon Marathon
August 2026
Aug
8
Sa

Falling Water Trail Marathon

Trail Run Half Marathon Marathon 63 km
Aug
9
Su

The ENDURrun

Trail Run 10 km 15 km ... 30 km Marathon
September 2026
Sep
12-13
Sa - Su

Tobermory Trail Race

Trail Run 5 km 7 km Half Marathon Marathon
Sep
13
Su

Georgina Marathon

5 km 10 km Half Marathon Marathon
Sep
19
Sa

That Dam Hill

5 km Half Marathon Marathon
October 2026
Oct
3
Sa

Muskoka Marathon

5 km 10 km Half Marathon Marathon
Oct
4
Su

The County Marathon

5 km Half Marathon Marathon
Oct
10-11
Sa - Su

Fall Colours Run

3 km 5 km ... 31 km Marathon
Oct
18
Su

Toronto Waterfront Marathon

5 km Half Marathon Marathon
Oct
25
Su

Niagara Falls Marathon

5 km 10 km Half Marathon Marathon
Oct
31
Sa

Hamilton Marathon Road2Hope

5 km 10 km Half Marathon Marathon